What Powers Wiki sites

I can only build websites with wordpress…but i want to try to build a wiki style site…

What program are wiki powered sites run in?

I will be using hostgator->fantastico to load it up…so what porgram am I loading?

A wiki script!

Loads listed at http://www.hotscripts.com/category/php/scripts-programs/wikis/

ah these are the 2 I see in the fantastico set-up

    	TikiWiki CMS/Groupware

which is better/easier to use/

Wikipedia (probably the most well known wiki) uses MediaWiki